Method of manufacturing acetyl ester compounds



Patented July 31, 1934 METHOD or MANUFACTURING ACETYL ESTER COMPOUNDS Kumazo Suganuma and Kan-Ichiro Goto, Tobe Machi, Naka-Ku, Yokohama, Japan No Drawing. Substitute for a No. 447,100, April 24, 1930. October 5, 1931, Serial No.

November 15, 1929 2 Claims.

The present invention relates to the method of manufacturing acetyl ester compounds, characterized by the fact that when hydroxy-carboxylic acid of aromatic compound or cellulose is acetylated, reaction is carried out by the direct employment of alkali acetate and sulfuryl chloride. The object thereof is to form acetyl oxide in solvent without using unstable acetyl chloride or expensive anhydrous acetic acid as in the known method and in nascent state to effect the acetylation and thus to manufacture acetyl ester compound in a simple and economical way, this application being substituted in place of our prior application Serial No. 447,100.

In order to acetylate hydroxy-carboxylic acid of aromatic compound or cellulose according to this invention, employ anhydrous alkali acetate as the source of supply of acetyl radicle, benzol or glacial acetic acid as solvent, and sulfurylchloride as dehydrating agent.

The following is the manner of manufacturing acetyl ester compounds according to the present invention:

When it is desired to manufacture acetyl cellulose, fill an acid proof reaction tank equipped with a stirrer and a cooler, with 800 volumes of the above-mentioned solvent, viz, acetic acid and put therein 500 volumes of fine powder of anhydrous sodium acetate, after which 200 volumes of sulfuryl chloride is poured thereinto and the stirrer is operated. Next, put in 100 volumes of cotton fibre. At this time, the temperature will pplication Serial This application 567,126. In Japan rise due to the heat of the combination and therefore it is necessary to regulate the temperature of the solution to 40 to 30- C. by cooling the tank.

Then, decomposition and substitution will occur among the constituents and the reaction fifteen hours.

completed in ten to Keep the solution Will be still for a while, and sodium sulphate and sodium chloride will be deposited. Separate them from the solid matters by a filter and pour the mother liquor into a big quantity of cold cellulose will come up Separate it, wash it with water and precipitate. then dry it.

atank containing water. Then, acetylated to the surface as white radicle.

We claim:

1. Method of manufacturing acetyl ester compounds, which consists in causing sulfuryl chloride and anhydrous sodium acetate to act upon cellulose in the presence of solvent in acetylating the cellulose.

2. Method of ,manufacturing acetyl compounds, which consists in mixing glacial acetic acid with anhydrous sodium acetate and sulfuryl chloride, adding thereto cellulose and then acetyl- 8 ating the cellulose.

KUMAZO SUGANUMA. KAN-ICHIRO GOTO. 

